А)2109+х=10108
х=10107-2109
х=7.998
у-954=39000
у=39000+954
у=39954
85300-z=7300
z=85300-7300
z=78000
k+5962=225962
k=225962-5962
k=220000
б)202•u=8080
u=8080:202
u=40
v•1200=3600
v=3600:1200
v=3
6100:w=305
w=6100:305
w=20
f:51=1000
f=1000•51
f=51000
г)(d-295)•13=260
d-295=260:13
d-295=20
d=296+20
d=316
25•(540-s)=2500
540-s=2500:25
540-s=1000
s=1000+540
s=1540